Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-26
Phys.Rev.Lett.95:181101,2005
Astronomy and Astrophysics
Astrophysics
v1: 4 pages, 1 figure; v2: added reference; v3: improved introduction, accepted to PRL; v4: added note about matter oscillatio
Scientific paper
10.1103/PhysRevLett.95.181101
Electromagnetic (and adiabatic) energy losses of pions and muons modify the flavor ratio (measured at Earth) of neutrinos produced by pion decay in astrophysical sources, $\Phi_{\nu_e}:\Phi_{\nu_\mu}:\Phi_{\nu_\tau}$, from 1:1:1 at low energy to 1:1.8:1.8 at high energy. The transition occurs over 1-2 decades of nuetrino energy, and is correlated with a modification of the neutrino spectrum. For gamma-ray bursts, e.g., the transition is expected at \~100 TeV, and may be detected by km-scale neutrino telescopes. Measurements of the transition energy and energy-width will provide unique probes of the physics of the sources. pion and muon energy losses also affect the ratio of $\bar\nu_e$ flux to total neutrino flux, which may be measured at the W-resonance (6.3 PeV): It is modified from 1/6 (1/15) at low energy to 1/9 (practically 0) at high energy for neutrinos produced in pp ($p\gamma$) interactions.
Kashti Tamar
Waxman Eli
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